Hi All.
I am using a K3 with internal 144 transverter module. On 2m I use a sequencer for TX/RX as I use a PA and a LNA at the masthead. The rig TX is triggered by the sequencer by using the PTT In line. The sequencer ensures the rig is switched after the LNA. The sequencer is triggered either by a foot switch or by the signalink Data line. The problem I have is that there is a HUGE risk (and I have done it) of inadvertantly using the manual TX button on the front of the K3. If this is done the rig goes to TX and teh sequencer is bypassed - thus blowing the LNA.. ouch. This issue is compounded by the fact that on all other bands I need conventional operation of the ring as there is obviously no problem with sequencers elsewhere and you get used to using eiher ptt or the tx button. Question then - is there a way of disabling/inhibiting the TX button/ mic socket ptt on the rig just on 2m so that on 2m you can only instigate TX via the back panel PTT in line? Help appreciated! Roger Banks GW4WND |
Hi Roger
Different solution ! You could use TX DLY. This delays the RF out from the K3 (setable in mS steps). Roger - G4BVY -----Original Message----- From: [hidden email] [mailto:[hidden email]] On Behalf Of Roger Banks Sent: 29 June 2011 10:36 To: [hidden email] Subject: [Elecraft] TX Inhibit options Hi All. I am using a K3 with internal 144 transverter module. On 2m I use a sequencer for TX/RX as I use a PA and a LNA at the masthead. The rig TX is triggered by the sequencer by using the PTT In line. The sequencer ensures the rig is switched after the LNA. The sequencer is triggered either by a foot switch or by the signalink Data line. The problem I have is that there is a HUGE risk (and I have done it) of inadvertantly using the manual TX button on the front of the K3. If this is done the rig goes to TX and teh sequencer is bypassed - thus blowing the LNA.. ouch. This issue is compounded by the fact that on all other bands I need conventional operation of the ring as there is obviously no problem with sequencers elsewhere and you get used to using eiher ptt or the tx button. Question then - is there a way of disabling/inhibiting the TX button/ mic socket ptt on the rig just on 2m so that on 2m you can only instigate TX via the back panel PTT in line? Help appreciated! Roger Banks GW4WND -- View this message in context: http://elecraft.365791.n2.nabble.com/TX-Inhibit-options-tp6528265p6528265.ht ml Sent from the Elecraft mailing list archive at Nabble.com. ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html |
Ok Roger - thanks for the input.
TX-DLY is an option I suppose but that means the sequencer will not be sequencing in the right order. ( I dont know if that is an issue or not). The sequencer has to switch the LNA first then switches the PA and K3 over together to tx. TXDLY. If I use TXD then they will all have to go over together and maybe there is a risk of RF getting to the LNA with the amp in TX awaiting RF from the K3? Roger |
It looks like TX delay is a max of 20ms, probably not enough for your
purpose. John G4ZTR -----Original Message----- From: [hidden email] [mailto:[hidden email]] On Behalf Of Roger Banks Sent: 29 June 2011 11:19 To: [hidden email] Subject: Re: [Elecraft] TX Inhibit options Ok Roger - thanks for the input. TX-DLY is an option I suppose but that means the sequencer will not be sequencing in the right order. ( I dont know if that is an issue or not). The sequencer has to switch the LNA first then switches the PA and K3 over together to tx. TXDLY. If I use TXD then they will all have to go over together and maybe there is a risk of RF getting to the LNA with the amp in TX awaiting RF from the K3? Roger -- View this message in context: http://elecraft.365791.n2.nabble.com/TX-Inhibit-options-tp6528265p6528369.ht ml Sent from the Elecraft mailing list archive at Nabble.com. ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html __________ Information from ESET NOD32 Antivirus, version of virus signature database 6249 (20110629) __________ The message was checked by ESET NOD32 Antivirus. http://www.eset.com __________ Information from ESET NOD32 Antivirus, version of virus signature database 6249 (20110629) __________ The message was checked by ESET NOD32 Antivirus. http://www.eset.com ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html |
In reply to this post by Roger Banks
Seems to me this -could- be done, but would require some modifications to
your sequencer system. Using the TX INH input (pin 7 or AUX connector on the K3, set TX INH to ON). You would need an output from your sequencer that stays low until TX permission is desired. This operation would be dependant on the band the K3 is on, so you would need to add logic to decode the Band0-3 outputs, and set CONFIG:KIO3 to TRN. Alternatively, you could use a KRC2 to access the auxbus data out to decode the TRN band. Again, added logic would activate the inhibit function only when 2M is selected, based on the output of the KRC2. This is all based on reading the signal descriptions in the K3 manual. I have not tried it. I am sure there are probably other ways to accomplish this. Good luck, Bruce, N1RX > Question then - is there a way of disabling/inhibiting the TX button/ mic > socket ptt on the rig just on 2m so that on 2m you can only instigate TX via > the back panel PTT in line? > Help appreciated! > Roger Banks > GW4WND ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html |
Thanks Bruce.
The sequencer is an SSB DCW2004 B. It does not seem to have a state-change output from rx to tx. It has inputs to earth or high to trigger the sequence and then delay outputs to sequence the devices. So I am note sure that would work.. Roger |
In reply to this post by Roger Banks
Roger,
You would add your own output that would stay low until the sequencer out for triggering the PTT on the rig is active. This output would also only inhibit the rig when on 2M (a requirement you mentioned), by monitoring the band data outputs of the radio. You would have to build this logic yourself, and add it to your sequencer. (probably not enough time before this weekend's VHF contest...) As I said, it would take some work. But what you are asking for is insurance against operator error. How much does it cost (in time and effort) to rebuild the LNA when you blow it? Or, you could just stay away from that TX button... ;-) 73, Bruce, N1RX > Thanks Bruce. > The sequencer is an SSB DCW2004 B. It does not seem to have a state-change > output from rx to tx. It has inputs to earth or high to trigger the sequence > and then delay outputs to sequence the devices. > So I am note sure that would work.. > Roger ______________________________________________________________ Elecraft mailing list Home: http://mailman.qth.net/mailman/listinfo/elecraft Help: http://mailman.qth.net/mmfaq.htm Post: mailto:[hidden email] This list hosted by: http://www.qsl.net Please help support this email list: http://www.qsl.net/donate.html |
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